CHAPTER) Xi 
BOLLEA. 
THIS genus consists of a small group of Orchids regarded 
by some botanists as Zygopetalums, but so distinct as to 
justify us in keeping them separate here. They have short, 
erect stems (not developing into pseudo-bulbs proper), 
bearing the sheathing leaves in opposite rows, and single- 
flowered, erect scapes. The flowers are full and large, 
usually 3in. to 4in. in diameter, with broad sepals and petals, 
a prominent crest on the lip, and a short, stout column. 
Culture.—Bolleas require warm-house treatment, and 
enjoy a shaded position, near the glass. They are found to 
succeed best on pieces of soft fern-stem, or, where that 
cannot be obtained, on blocks or rafts of teak, which should 
hang horizontally. The roots should have a little sphagnum 
placed about them, and frequent dippings overhead are 
necessary during the period of growth; in hot weather the 
plants should be looked over both night and morning. 
Thrips are apt to infest these plants, and soon do serious 
damage, so that, on the slightest indication of their presence, 
tobacco-dust or tobacco-water should be at once applied. 
B. celestis—A bright and distinctly-coloured species, 
well worth cultivating on account of its unusual tints, which, 
if not actually the much-coveted blue, are a near approach. 
